Perches

Always remember chickens will naturally roost on the highest perch bar, it's to do with the pecking order and domination. So if you do want to build a chicken coop, place perches at the same height. It is always better to have removable perches as mites can hide under the perch ready to attack at night especially red mites. In addition make perches wide preferably about 5cm so it's comfortable for the girls' feet.
Good Luck!!